Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 0)}.
A151295
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =93a(5) =364a(6) =1490a(7) =6178a(8) =26163a(9) =112001a(10) =485272a(11) =2120168a(12) =9336512a(13) =41376649a(14) =184414880a(15) =825963661a(16) =3715457866a(17) =16777860859a(18) =76025036272a(19) =345560464513
External references
- oeis: A151295